Teh·ran or Te·he·ran (tĕ′ə-răn, -rän, tĕ-răn, -rän)
The capital and largest city of Iran, in the north-central part of the country south of the Caspian Sea. A commercial and industrial center, it became the capital of Persia (Iran) c. 1788 and was modernized under Shah Mohammad Reza Pahlavi (ruled 1941-1979).
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.